Or you know they could be worried about those submarines drug smugglers are using, those things could be used to smuggle Omar Ackbar and his 50 pounds of cesium or strontium and 5 pounds of explosives. Bomb made of that shiat detonated in Washington or New York would ruin a whole lot of real estate.

Also a net of drones would be good for ferreting out things like Russian and Chinese attack submarines.